Thanks Johng. I did check the pump and didn’t find anything inside it. The rotor moves freely. Yes, I’m aware of the two buttons to run the drain pump. I have used this to drain the tub in the dishwasher. It’s interesting that on the LG dishwasher the pump works on cycles - it runs for a few seconds, then stops, runs a few seconds…. So it doesn’t do a complete drain in one shot. I happen to have another LG dishwasher same model and it does the same thing when running and draining (and it works fine). So I think at this stage I will try a new pump and see what happens.